The cause of the crash is under investigation. The missing aviators were onboard a EA-18G Growler that took off from Naval Air Station Whidbey Island during a training flight. It reportedly crashed at around 3:23 p.m. Tuesday, according to the Navy.

YAKIMA COUNTY, Wash.-Search and rescue efforts at the crash site of a Navy jet just east of Mount Rainier are ongoing.

The wreckage was found on a mountainside east of Mount Rainier, the Navy said. The status of the plane's two crew members was still unknown.